Alien Armor (aka Combined Armor) is arguably the best armor in the game right now, even with the inclusion of the OFAB set. Alien armor has buffs and armor class values that surpass all other armors in terms of the sheer weight of bonuses. Given this, Alien Armor also has a very complex tradeskill process needed to construct it that is slightly dis-similar to other armors.

Combined alien armor consists of two different alien armor parts which need to be combined.
You need 6x the QL of Supple/Enduring/Arithmetic armor in psychology for this process.
Below you can see a list of all different possibilities.

The Strong/Spiritual/Observant Armor QL need to be 80% of Supple/Enduring/Arithmetic Armor QL!